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It's possible that you do not have your bobbin or bobbin case in correctly. If you do not have your user's manual (which you should use like your bible), download it free at the Singer website. Review the threading steps for both top and bottom.

One more VERY IMPORTANT thing. On ANY model sewing machine going back to their invention from any company, you MUST thread with the presser foot UP. That is because there are tension disks that apply tension to the upper thread that are ONLY spread apart when the foot is up. If it's down, the thread can't get between them, and there's no tension on the upper thread. That might also be your problem.

the looping on the bottom usually is a tension problem, the top & bottom tension are unequal usually fixed by adjusting the top tension.
some people that I've talked with have had success with changing to a different size needle ( depends what type of thread is being used).
when the machine is threaded the foot needs to be up ( this releases tension on the thread), when the foot is lowered it the tension is set on the thread. if the material being sewed is too thick it raises the foot too high & releases tension on the thread ( the material has to be really thick to do this).
if there a piece of thread or lint in or around the tensioner or bobbin area it could cause trouble.
other wise if you've tried everything you can think of, take it back th the store & have them try it & tell you what is wrong.

I went to the singer website & typed the number in 6218 & it came up with nothing, is that the correct model number?
the tension problem try adjusting the top thread tension to 3-5, & see if that helps the loose tension

The manual can be downloaded for free from Singer's web site...Are you seeing loops of the upper thread on the bottom side? If so, then the bobbin tension is too tight, or the upper tension is too loose. The threaded shaft on the upper tension might have stripped, leaving you with no adjustability.